﻿<p><u>Definition from IAI</u>: If there are several instances of
<i>IfcGeometricRepresentationContext</i> within one project file,
the XY plane of all <i>WorldCoordinateSystem</i>'s shall be
coplanar and identical.</p>
<blockquote><small>NOTE  The instances of
<i>IfcGeometricRepresentationSubContext</i> do not define their
own world coordinate system, they refer to the world coordinate
system of the <i>ParentContext</i>.</small></blockquote>
<blockquote><small><font color="#0000FF">HISTORY  New global rule
in Release IFC2x</font></small></blockquote>